Distributing-valve for steam-engines.



APPLICATION FILED MAR. 3'); 1912.

mml.

2 SHESA i. STUMPF.

'STHIBUTHJG VALVE, FOR STEAM ENGNES.

MQJLICATJON min MAR. a0. |912.

1,155,451 Pnnicd Gat. 5, 1915.

- UNTTED STATES PATENT oFFioE.

JOHANN STUMPF, OF BERLIN, GERMANY.

DISTRIBUTING-VALVE To all 'whom it may concern i Bev-it known that I,.lorraxx SIUarrr, asubject ofgt-he King. ofl.l.iussia,`resident of 33Kurfrstendamm, Berlin, German. Em-

pire, professor, have invented certain newv and useful Improvements inDistributing'- \{al`ves for Stcarnfljlnginesfof which the fol- .lowingis aV specifica tion.

.This invention lrelates" to improvements in mccliaiiisi'n for operatingthe distribution with thel axis of the cylinder and extend toward oneanother, are actuated by one arm of a. pivoted `lever which` fitsbetween the abutting ends of the valve spindles. This lever isactuatedby a rocking member to which a comparatively slow and uniformrocking motion is imparted ioma movingV partof the engine,l such as aneccentric on.

' the crank shaft or va'connection. from the cr'ninectng rod. Motion istransmitted from the rocking member to the. pivoted lever through whatwill be hereafter, termed a cui-ve-tiansmission-motion the coacting surlfaces of said'lever or rockingmemler being curved in sucha manner thatthe'iiniform l rocking movement of the rocking member is transformedinto a rapid and intermittent l or'jerking motion -on the part of thepivotcd liever` which in turn actuates the valve spindles in like mannerIt`willthus be seen that the only'r parts subjected to the rapid andintcrmiltent or jerking4 motion are the valve spindles and 'Divotedlleverywhereas the greater mass of the mechanism` namely, tbeyrockinglever and the iiarts operating the samel more uniformly andcomparatively slowly. .y f

The presi-ut invention will be readily understood from the following-'description of one construction given by way of example in theaccouipanying drawings in which Figui-c l is a side sectional elevationthrough the cylinder of an engine provided with valve operatingYmechanism `for t\vo v pivoted lever hand thc valve spindles g.

inlet valves. Figa-2 is a cross sectional elevation through the centerVof the cylinder SpecicationofLetters Patent.

l Application 'iledMai-'ch 39,

FOR vsTEAM Eivorlvizs sho-wn in Fig. 1.' Fig. 3 illustrates-a modi.-

jlied vforni in side sectional elevation.

According to the forni shown in Fig. 1 the exhaustfrom the' steamcylinder a is effected through the ports (l, which are controlled by thepiston during its travel. The inletof.

steam from the steam spares' e, on'tli'e ends of the double acting.cylinder is controlled Patented Oct. 5, 1915.'

i912. seria1iio.se7,42a. Y

by lift valves c, which admit steamfromthe spares e, to the cylindei.'af, through the ports (l. )he valves c; are shown' of the unbalancedtype and are. pressed to tlieirscats by means of springs f. Suchunbalanced valves may he employed in engines of the type describedbecause high compression takes placel with the i'esult,' that, at themoment when the valves are. opened, no afi'prwiable difference inpressure exists on the two sides of thc valve. The steu'is f/ oftheval'ves c are arranged parallel with' the axis of the cylinder andextend toward one another, so

thatitheyvare only seria-rated.v byZan a-rin ofanostallatingvhorned-leveipivoted'loosely :It h'. grooves which :meist inltlie lubrication of the parts and thc-stems.

The iiiv-oted' lever L isfoperated from a Vrocking lever l'i: througlia,curve-transmis# Asionimotion, the pi rote-d lever h being prof.-

vided with two hornsfi'l,Y hi, between which there is an arcuatepartIr"- o'ver which -a roller la on the rocking lever :A may-roll.'Tlielmiddle part of the arc *hi2 is of such' curvature that. theioller/c when incontact therewith does not impartmotion to the lever li, whilethev ends of the arc h3 are curved somewhatinwardly so thatwhen therocking Vlever k is near -t-hc end of Aits rock'- ing movement itimparts a sudden'iiiotionV to the lever It, the curvature of the endparts of the are /f being such that no impact occurs. The rocking leveris `mounted on a flhc stems are provided withj 'also seive aspac-vkii'ig'iingsfor eisv rock shaft '/n, which carries an ari Qo rockedTlic horn lever li, rocft'ing lever :ind the ios scribed arrangement .ofoperating gear may be applied lto other forms vofvalvessuch as slidevalves.

In the form illustrated in Fig. 3, the' invention is shown applied to apartially balaneed lift valve C, which closes on twofaces D D. In thiscase, the pivoted lever H is provided at the extremities of its hornswith -lfollers which engage curved surfaces K on the rocking lever K,the curvature of the surfaces K and the Contact thereof with the rolierson the lever H being such that the same effect-is obtained as by themechanism described with reference to Figs. l and 2.

lt will be understood that if desired, the vaives D may be completelybalanced.

1. A power cylinder having an inletl port et. each end, valves for saidports, valve actuating spindles having ends approaching each other,spindle-actuating means comprising two members coacting throu h a camface on one, Yone member actuated y a uniformly moved part of theengineg'the other member' transmitting to thevspindles alternatelyintermittent quick movements.

A power cylinder having an inlet port at each end, valves for saidports, valve actuating spindles having ends approaching each other,spindle-actuating means comprising two pivotally movable members c0-acting through a cam face on one, one member actuated by a uniformlymoved part of y uniformly moved part-of the engine, the.

other member transmitting to the spindles alternately intermittent`quick movements,

and an oil containing chamber' inclosing said two members and theSpindleends.

In witness whereof I have hereunto -set my hand in the presence of tv'vowitnesses.

u JOHANN STUMPF. Witnesses:

SELMA ll/ILKE, JOAN JOHANNA STUMPF.

